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A closed orgain pipe of length l(0) is r...

A closed orgain pipe of length `l_(0)` is resonating in `5^(th)` harmonic mode with rod clamped at two points `l` and `3l` from one end. If the length of the rod is `4l` and it is vibrating in first overtone. Find the length of the rod. [Velocity of sound in air `=v_(s)` Young's modulus for the rod `Y` and density `rho`]

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